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Fresh Start Accounting - Estimated Fair Value of Debt at Emergence (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jul. 02, 2018
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Fresh-Start Adjustment [Line Items]          
Carrying value after reorganization adjustments       $ 6,177 $ 6,623
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans   $ (24) $ 0 $ (44) $ (47)
Debt, fair value $ 7,301        
Secured Debt | Senior secured notes          
Fresh-Start Adjustment [Line Items]          
Carrying value after reorganization adjustments 866        
Write-off of unamortized debt issuance costs 9        
Write-off of discounts for pre-issuance accrued interest settled upon issuance of senior secured notes (4% cash interest of $5 million and 8% paid-in kind interest of $10 million) 15        
Debt, fair value $ 890        
Stated interest rate, cash portion (as a percent) 4.00%   4.00%    
$5 million applicable to 4% cash interest     $ 5    
Stated interest rate, paid-in-kind portion (as a percent) 8.00%   8.00%    
$10 million applicable to 8% paid-in-kind interest     $ 10    
Secured Debt | Credit facilities contained within variable interest entities          
Fresh-Start Adjustment [Line Items]          
Carrying value after reorganization adjustments $ 736        
Write-off of unamortized debt issuance costs 1        
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans (33)        
Debt, fair value 704        
Floating rate debt obligations | Senior Credit Facilities          
Fresh-Start Adjustment [Line Items]          
Carrying value after reorganization adjustments 5,636        
Write-off of unamortized debt issuance costs 26        
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans (155)        
Debt, fair value 5,507        
Total          
Fresh-Start Adjustment [Line Items]          
Carrying value after reorganization adjustments 7,238        
Write-off of unamortized debt issuance costs 36        
Write-off of discounts for pre-issuance accrued interest settled upon issuance of senior secured notes (4% cash interest of $5 million and 8% paid-in kind interest of $10 million) 15        
Fair value adjustment to record discount on the senior secured credit facilities and Ship Finance Loans (188)        
Debt, fair value $ 7,101